The data coming from the USRP1 is &plusmn; 32767 as the floating point range. In the USRP2 we use &plusmn; 1.0<ref>[http://lists.gnu.org/archive/html/discuss-gnuradio/2009-09/msg00288.html Discuss-gnuradio mailing list, 22 Sep 2009]</ref>.

+

+

In comparison, audio source and sink has range &plusmn; 1.0

+

+

=== Filtering ===

+

+

If the decimation is a factor of four there are two half-band filters + CIC filter, if it is a multiple of two (i.e. even, but not a factor of four) then there is only one half-band filter + CIC, and if it is an odd number, just a CIC filter<ref>[http://lists.gnu.org/archive/html/discuss-gnuradio/2009-10/msg00216.html Discuss-gnuradio mailing list, 26 Oct 2009]</ref>.

== RFX1200 ==

== RFX1200 ==

Line 13:

Line 59:

|-

|-

| Frequency

| Frequency

−

|

+

| 1150 - 1450 MHz

+

|-

+

| Noise Figure

+

| 6-10 dB

+

|-

+

| TX Power

+

| 200 mW (23 dBm)

|-

|-

| Antenna

| Antenna

Line 30:

Line 82:

| 49

| 49

|}

|}

+

+

The AUX ADC is used to measure received signal level<ref name="auxadc">Email from Matt Ettus, http://lists.gnu.org/archive/html/discuss-gnuradio/2010-01/msg00321.html</ref>. The AUX DACs are used to set gains on most of the daughterboards<ref name="auxadc" />.

* Being a TV tuner, TVRX has 75 &Omega; input. When using 50 &Omega; cables and antenna, this will result in an SWR of ~ 1.5 (TBC), which is not that bad considering all other deficiencies of a TV tuner.

+

* I have measured the sensitivity to be between -123 ... -126 dBm (0.11 and 0.14 µV) using a CW signal, SSB receiver and RF gain set to 71.

+

* The TVRX can only receive up to 6 MHz channels (NTSC channel?).

+

* Nick Foster on TVRX gain<ref>Email Dec 21, 2010 - link TBD</ref>: ''"The TVRX gain is set via an analog pin and isn't even guaranteed to be monotonic, let alone accurate. It varies with temperature as well. I've tried to compensate for what I can, but the absolute gain really can't be controlled very tightly."''

The DBSRX has a programmable channel filter at the output that can be programmed within 1 and 60 MHz.

+

'''Python:''' u.subdev.set_bw(1e6) # set bandwidth to 1 MHz

+

+

'''C++:''' TBD

+

+

{|

+

|-

+

|[[Image:DBSRX-ChanFilt-10MHz.png|thumb|400px|Channel filter set to 10 MHz.]]

+

|[[Image:DBSRX-ChanFilt-1MHz.png|thumb|400px|Channel filter set to 1 MHz.]]

+

|}

== LFRX ==

== LFRX ==

Line 94:

Line 228:

|}

|}

−

+

* Input power level: +10 dBm will clip, more than +17dBm could cause damage.

+

* With a good and matched antenna, LFRX can receive hamradio traffic without preamp, see http://www.youtube.com/watch?v=BF3VgsKdnUE

+

* Subdevice0 is the antenna A, Subdevice1 is the antenna B. You can use both subdevice 0 and 1 at the same time on two different ddc inputs and tune them separately. These subdevices are used as real inputs, and the Q inputs to the ddc are set to zero. The third possibility is to use subdevice2 which treats the antenna A and B as a single complex input (I and Q), and connects them to the I and Q inputs of the DDC input0. When using subdevice2, you cannot use subdevice 0 and 1.<ref>Email from Josh Blum, 21 Feb 2010</ref>

+

* Sensitivity of LFRX measure to be between -102 and -97 dBm (1.8 and 3 µV) using a CW signal, SSB receiver and gain set to 20 dB.

* Subdev A:A is daughterboard in slot A, antenna A. It i a real subdevice and only the I channel of the DUC is connected<ref name="lftx">[http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2011-January/000516.html USRP Users List 27 Jan 2011]</ref>.

+

* Subdev A:AB is daughterboard in slot A, antenna A and antenna B. I from the DUC is connected to A and Q to B<ref name="lftx" />.

USRP

The data coming from the USRP1 is ± 32767 as the floating point range. In the USRP2 we use ± 1.0[1].

In comparison, audio source and sink has range ± 1.0

Filtering

If the decimation is a factor of four there are two half-band filters + CIC filter, if it is a multiple of two (i.e. even, but not a factor of four) then there is only one half-band filter + CIC, and if it is an odd number, just a CIC filter[2].

RFX1200

Specifications

Rev

3.0

Frequency

1150 - 1450 MHz

Noise Figure

6-10 dB

TX Power

200 mW (23 dBm)

Antenna

TX/RX and RX2

GPIO

Power

__ V / __ mA

Size (mm)

142 x 69

Weight (g)

49

The AUX ADC is used to measure received signal level[3]. The AUX DACs are used to set gains on most of the daughterboards[3].

RFX2400

Specifications

Rev

Frequency

2.3 - 2.9 GHz

Noise Figure

6-10 dB

TX Power

50 mW (17 dBm)

Antenna

TX/RX and RX2

GPIO

Power

__ V / __ mA

Size (mm)

142 x 69

Weight (g)

49

The AUX ADC is used to measure received signal level[3]. The AUX DACs are used to set gains on most of the daughterboards[3].

TVRX

Specifications

Rev

Frequency

50 - 870 MHz

Noise Figure

8-10 dB

Antenna

GPIO

Power

__ V / __ mA

Size (mm)

Weight (g)

78

Being a TV tuner, TVRX has 75 Ω input. When using 50 Ω cables and antenna, this will result in an SWR of ~ 1.5 (TBC), which is not that bad considering all other deficiencies of a TV tuner.

I have measured the sensitivity to be between -123 ... -126 dBm (0.11 and 0.14 µV) using a CW signal, SSB receiver and RF gain set to 71.

The TVRX can only receive up to 6 MHz channels (NTSC channel?).

Nick Foster on TVRX gain[4]: "The TVRX gain is set via an analog pin and isn't even guaranteed to be monotonic, let alone accurate. It varies with temperature as well. I've tried to compensate for what I can, but the absolute gain really can't be controlled very tightly."

Subdevice0 is the antenna A, Subdevice1 is the antenna B. You can use both subdevice 0 and 1 at the same time on two different ddc inputs and tune them separately. These subdevices are used as real inputs, and the Q inputs to the ddc are set to zero. The third possibility is to use subdevice2 which treats the antenna A and B as a single complex input (I and Q), and connects them to the I and Q inputs of the DDC input0. When using subdevice2, you cannot use subdevice 0 and 1.[5]

Sensitivity of LFRX measure to be between -102 and -97 dBm (1.8 and 3 µV) using a CW signal, SSB receiver and gain set to 20 dB.